999999364691 has 2 divisors, whose sum is σ = 999999364692. Its totient is φ = 999999364690.

The previous prime is 999999364667. The next prime is 999999364733. The reversal of 999999364691 is 196463999999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999999364691 - 2¹⁰ = 999999363667 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999364621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999682345 + 499999682346.

It is an arithmetic number, because the mean of its divisors is an integer number (499999682346).

Almost surely, 2^999999364691 is an apocalyptic number.

999999364691 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999364691 is an equidigital number, since it uses as much as digits as its factorization.

999999364691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2066242608, while the sum is 83.

The spelling of 999999364691 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, three hundred sixty-four thousand, six hundred ninety-one".